This is not always working, due to the version of NTS library that is being used.
Both the plug-in and the library are scheduled to be rewritten using GEOS methods.
This script is showing how to do that in the mean time:
Open the shapefile you want to work with. Select the shapes you want to merge using the selection tool or a query in the attribute table editor.
Run the script.
A new shapefile has been made in the same folder as the original shapefile. No attributes have been copied.
Hope it helps.
Don't forget to read the new documentation: www.mapwindow.org/documentation/mapwingis4.8
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